Siemens 3AH3, Operating Instructions Manual

Page: 20 / 64

Description
20 9229 9860 176 0E
2013-08-22
Pole assembly The pole assembly (19.) of the 3AH3 vacuum circuit-breaker consists of
•
the upper interrupter support (20.)
• with the upper terminal (27.)
• the vacuum interrupter (30.),
• the lower interrupter support (40.) with the lower terminal (29.) and the clamp
(29.2) with flexible connector (29.1);
• as well as the angle lever (48.6.).
The centering (28.1) and the struts (28.) relieve the vacuum interrupters of external
forces.
Contact system in the interrupters
A slight change in the contact stroke that occurs over the entire useful life of the
interrupter has no effect on the function of the vacuum circuit-breaker. There is no
need for a status indicator for the contact system.
Fig. 23 Pole assembly (I) Fig. 24 Pole assembly (II and III)
19. Pole assembly 29.1 Flexible connector
20. Upper interrupter support 29.2 Clamp
27. Upper terminal 30. Interrupter
28. Strut 40. Lower interrupter support
28.1 Centering 48.6 Angle lever
29. Lower terminal